There’s so much competition nowadays, almost no indie can achieve nearly enough sales for a living wage. And ironically, the best way to get more attention is to make your product free, hence more and more artists doing free + paid merch.
The YouTube income for most small creators get folded back into the channel. Getting a $100 check from YouTube isn’t going to pay your rent, but it makes purchasing some better lighting or a new microphone for the channel an easy choice, which in turn helps them grow and enjoy their hobby channel more.
The argument that the dollar amount is low and therefore it’s okay if we push it all the way to $0 is unconvincing for anyone familiar with how small time creators grow.
Not linking the author's name and patreon is a problem, but I don't think it needs laws and definitely not copyright; if somebody gets the video on the other place to link the original author's patreon, even if they're not who uploaded it, it benefits them and I don't see any serious issue.